PERTH, AUSTRALIA - DECEMBER 18: Peter Burling and Blair Tuke of New Zealand compete during the medal race for the 49er Men's Skiff Class of the 2011 ISAF Sailing World Championships on December 18, 2011 in Perth, Australia. (Photo by Paul Kane/Perth 2011)

PERTH, AUSTRALIA - DECEMBER 18: Dorian van Russelberghe of the Netherlands celebrates winning the World Championship on day 16 after the RS:X Men's Windsurfer Medal Race of the 2011 ISAF Sailing World Championships on December 18, 2011 in Perth, Australia. (Photo by Paul Kane/Perth 2011)

PERTH, AUSTRALIA - DECEMBER 18: Jo Aleh and Olivia Powrie of New Zealand compete on day 16 during the 470 women's two person dinghy medal race of the 2011 ISAF Sailing World Championships on December 18, 2011 in Perth, Australia. (Photo by Paul Kane/Perth 2011)

PERTH, AUSTRALIA - DECEMBER 18: Hannah Mills and Saskia Clark of Great Britain compete on day 16 during the 470 women's two person dinghy medal race of the 2011 ISAF Sailing World Championships on December 18, 2011 in Perth, Australia. (Photo by Paul Kane/Perth 2011)

PERTH, AUSTRALIA - DECEMBER 18: John Pink and Rick Peacock of Great Britain compete during the medal race for the 49er Men's Skiff Class of the 2011 ISAF Sailing World Championships on December 18, 2011 in Perth, Australia. (Photo by Paul Kane/Perth 2011)